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Originally Posted by f5fstop
Sometimes, and it is not that often, the system will react to multiple low sensor readings as being a problem. If all pressures are ok, do what Hummer Guy suggested. If that does not work, it is time to visit the dealer.
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Interesting -- I figured it wasn't low tires because of the "Low Tire" reading -- I didn't know multiple low sensors could cause the "Service TPM"...good to know.